Great idea, ++! In fact, it's something I've been toying around with trying as well, I'm glad you beat me to it (I'm not much of a GUI programmer).

I do have one feature suggestion/request. Either (a)include support for entering text in non-rich forms (like Markdown), or (b)provide a plugin text-processing architecture so other people can choose to provide Markdown/WikiText/etc. support. This would ideally be combined with the option to select a "plain text mode" for entry, then render appropriately.